Watermelon leaf blight is a leaf disease that harms watermelon. In recent years, it has gradually increased. In the middle and late stages of watermelon growth, especially in the rainy season or after a heavy rain, the incidence is often rapid and rapid development, so that the melon leaves quickly change Black scorch and loss of photosynthesis capacity seriously affect the quality and yield of watermelon.
Bacterial leaf blight is a fungal disease. Pathogens can be affected by temperatures ranging from 10 to 36°C and relative humidity higher than 80%. Rainy weather, when the relative humidity is higher than 90%, is susceptible to epidemics or occurrence. Such as in the expansion of watermelon, can make a large area of ​​melon field leaves dead, seriously affecting the yield. Continuous cropping, partial application or reapplication of nitrogenous fertilizer, weak soil or water retention, plant resistance to disease is weak, and the disease is heavy. Continuous sunshine, long sunshine, inhibition of the disease.
Control methods: Spray 75% chlorothalonil wettable powder 500 to 600 times, 50% acetaminophen wettable powder 1000 times, and 1/10000 fulcrum 481 Ester), after the onset or humidity, 80% of Dasheng M-45 wettable powder (mancozeb) 600 times liquid, one ten-thousandth of feng, 481, 50% skeletal wettable powder 1500 times , 70% mancozeb WP 400 to 500 times liquid. Spray once every 5 to 7 days, even spray 3 to 4 times, and pay attention to the rain after the spray and field drainage. 481 can effectively reduce drug damage, promote growth, reduce the incidence of disease.
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